fix: loading vocabs from node ESM

.changeset/purple-seals-talk.md

@@ -0,0 +1,5 @@
+---
+"@hydrofoil/vocabularies": patch
+---
+
+`vocabularies` export would not work in node using ES modules

loadDataset/index.mjs

@@ -1,4 +1,22 @@
 import stringToStream from 'string-to-stream'
+
+const AsyncFunction = (async function () {}).constructor;
+
 export async function loadDatasetStream (prefix) {
+  if (is_node()) {
+    const path = new URL(`../ontologies/${prefix}.nq`, import.meta.url).toString()
+    const nodeLoad = new AsyncFunction('path', `
+      const { createReadStream } = await import('fs')
+      const url = await import('url')
+      return createReadStream(url.fileURLToPath(path))
+    `)
+
+    return nodeLoad(path)
+  }
+
   return stringToStream((await import(`../ontologies/${prefix}.nq`)).default)
 }
+
+function is_node() {
+  return typeof global !== 'undefined' && global.global === global;
+}